rxdb/dist/esm/event-reduce.js

A local-first realtime NoSQL Database for JavaScript applications - https://rxdb.info/

import { calculateActionName, runAction } from 'event-reduce-js';
import { rxChangeEventToEventReduceChangeEvent } from "./rx-change-event.js";
import { arrayFilterNotEmpty, clone, ensureNotFalsy, getFromMapOrCreate } from "./plugins/utils/index.js";
import { getQueryMatcher, getSortComparator, normalizeMangoQuery } from "./rx-query-helper.js";
export function getSortFieldsOfQuery(primaryKey, query) {
  if (!query.sort || query.sort.length === 0) {
    return [primaryKey];
  } else {
    return query.sort.map(part => Object.keys(part)[0]);
  }
}
export var RXQUERY_QUERY_PARAMS_CACHE = new WeakMap();
export function getQueryParams(rxQuery) {
  return getFromMapOrCreate(RXQUERY_QUERY_PARAMS_CACHE, rxQuery, () => {
    var collection = rxQuery.collection;
    var normalizedMangoQuery = normalizeMangoQuery(collection.storageInstance.schema, clone(rxQuery.mangoQuery));
    var primaryKey = collection.schema.primaryPath;

    /**
     * Create a custom sort comparator
     * that uses the hooks to ensure
     * we send for example compressed documents to be sorted by compressed queries.
     */
    var sortComparator = getSortComparator(collection.schema.jsonSchema, normalizedMangoQuery);
    var useSortComparator = (docA, docB) => {
      var sortComparatorData = {
        docA,
        docB,
        rxQuery
      };
      return sortComparator(sortComparatorData.docA, sortComparatorData.docB);
    };

    /**
     * Create a custom query matcher
     * that uses the hooks to ensure
     * we send for example compressed documents to match compressed queries.
     */
    var queryMatcher = getQueryMatcher(collection.schema.jsonSchema, normalizedMangoQuery);
    var useQueryMatcher = doc => {
      var queryMatcherData = {
        doc,
        rxQuery
      };
      return queryMatcher(queryMatcherData.doc);
    };
    var ret = {
      primaryKey: rxQuery.collection.schema.primaryPath,
      skip: normalizedMangoQuery.skip,
      limit: normalizedMangoQuery.limit,
      sortFields: getSortFieldsOfQuery(primaryKey, normalizedMangoQuery),
      sortComparator: useSortComparator,
      queryMatcher: useQueryMatcher
    };
    return ret;
  });
}
export function calculateNewResults(rxQuery, rxChangeEvents) {
  if (!rxQuery.collection.database.eventReduce) {
    return {
      runFullQueryAgain: true
    };
  }
  var queryParams = getQueryParams(rxQuery);
  var previousResults = ensureNotFalsy(rxQuery._result).docsData.slice(0);
  var previousResultsMap = ensureNotFalsy(rxQuery._result).docsDataMap;
  var changed = false;
  var eventReduceEvents = rxChangeEvents.map(cE => rxChangeEventToEventReduceChangeEvent(cE)).filter(arrayFilterNotEmpty);
  var foundNonOptimizeable = eventReduceEvents.find(eventReduceEvent => {
    var stateResolveFunctionInput = {
      queryParams,
      changeEvent: eventReduceEvent,
      previousResults,
      keyDocumentMap: previousResultsMap
    };
    var actionName = calculateActionName(stateResolveFunctionInput);
    if (actionName === 'runFullQueryAgain') {
      return true;
    } else if (actionName !== 'doNothing') {
      changed = true;
      runAction(actionName, queryParams, eventReduceEvent, previousResults, previousResultsMap);
      return false;
    }
  });
  if (foundNonOptimizeable) {
    return {
      runFullQueryAgain: true
    };
  } else {
    return {
      runFullQueryAgain: false,
      changed,
      newResults: previousResults
    };
  }
}
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